Add super powers to your RetroShields
Designed by 8-Bit-Force in United States of America
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2023-08-29: Holding off international shipments until I figure out the updated fees. Please stay tuned. Warning: This requires Teensy 3.5 or 3.6 boards which are out of production. What is it? This b…
Read More…2023-08-29: Holding off international shipments until I figure out the updated fees. Please stay tuned.
Warning: This requires Teensy 3.5 or 3.6 boards which are out of production.
This board lets you connect your RetroShields to Teensy 3.5 and add super-powers to your 8bit microprocessor :)
This board also supports NGT30 Video/Keyboard Shield. I like NGT30 because it is possible to make your own stand-alone computer :)
Two options:
Teensy is faster and more capable platform than Arduino, however I had two issues w/ existing Teensy adapter boards:
First was voltage level mismatch. Teensy 3.5 is advertised as 5V-tolerant. What it really means is its inputs are 5V-tolerant. It still outputs 3.3V signals. For most 5V devices, 3.3V is high enough to register logic-high but some microprocessors wanted higher voltages. These did not work reliably or not work at all. Hence I needed true 3.3V <-> 5.0V level shifting.
Second, we read 16bits of address bus and read/write 8bits of data bus to/from the processors. Existing teensy adapters required reading several bit at different gpios and then several bit shift/or/and operations. This wasted precious teensy cycles. I reassigned the Teensy gpio's in groups of 8bit ports to the arduino mega header so reading databus and/or address buses take single cycle teensy instructions. This helps us run the microprocessor fast.
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Product: (5.00)
Documentation: (4.60)
Shipping: (5.00)
Communication: (4.80)
Tim | May 11, 2021
Pierre | March 3, 2021
Jay | Aug. 7, 2020
John | June 15, 2020
Alessandro | May 14, 2020
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